Pinpoint Test B : Grinding, Popping Or Chattering Noise From The Rear Axle On Acceleration From A Stop Or On A Turn: Notes

WARNING: This page is about a different variant/trim than selected.

Refer to OEM WIRING DIAGRAMS (EXCEPT ELECTRIC) for schematic and connector information.

Normal Operation and Fault Conditions

The AWD system is an active system, which means it not only responds to wheel slip between the front and rear axles but also has the ability to anticipate wheel slip and transfer torque to the rear wheels before the slip occurs. The AWD system is active all the time and requires no input from the operator. The AWD system continuously monitors vehicle conditions and automatically adjusts the torque distribution between the front and rear wheels. During normal operation, most of the torque is delivered to the front wheels. If wheel slip between the front and rear wheels is detected, if the vehicle is under acceleration or if the vehicle is in a handling event, the AWD system increases and distributes torque to each rear wheel as needed. When the AWD system is functioning properly, there should be no perceived speed difference between the front and rear axles when launching or driving the vehicle on any uniform surface. Traction should be similar to a part time 4WD system in 4H (4X4 HIGH), but have no binding in turns.

Possible Causes

Wiring, terminals and connectors
ABS system
AWD module
Rear drive unit (RDU)
- Worn clutch plates

Visual Inspection and Diagnostic Pre-checks

Wheel speed sensor wiring harness

WARNING: When directed to drive the vehicle as part of this test, drive the vehicle on a hard surface in an area without traffic to prevent a crash. Failure to follow these instructions may result in personal injury.